123861431 has 4 divisors (see below), whose sum is σ = 124448664. Its totient is φ = 123274200.

The previous prime is 123861427. The next prime is 123861443. The reversal of 123861431 is 134168321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123861431 - 2² = 123861427 is a prime.

It is a super-2 number, since 2×123861431² = 30683308178735522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123861394 and 123861403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123861421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293300 + ... + 293721.

It is an arithmetic number, because the mean of its divisors is an integer number (31112166).

Almost surely, 2^123861431 is an apocalyptic number.

123861431 is a deficient number, since it is larger than the sum of its proper divisors (587233).

123861431 is an equidigital number, since it uses as much as digits as its factorization.

123861431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587232.

The product of its digits is 3456, while the sum is 29.

The square root of 123861431 is about 11129.3050546743. The cubic root of 123861431 is about 498.4772753268.

The spelling of 123861431 in words is "one hundred twenty-three million, eight hundred sixty-one thousand, four hundred thirty-one".